content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.Iterator;
  
  final class IxJoin<T> extends IxSource<T, String> {
  
      final CharSequence separator;
  
      IxJoin(Iterable<T> source, CharSequence separator) {
          super(source);
          this.separator = separator;
      }
  
      @Override
      public Iterator<String> iterator() {
          return new JoinIterator<T>(source.iterator(), separator);
      }
  
      static final class JoinIterator<T> extends IxSourceIterator<T, String> {
          final CharSequence separator;
  
          JoinIterator(Iterator<T> it, CharSequence separator) {
              super(it);
              this.separator = separator;
          }
  
          @Override
          protected boolean moveNext() {
              CharSequence sep = separator;
  
              Iterator<T> it = this.it;
  
              StringBuilder b = new StringBuilder();
  
              if (it.hasNext()) {
                  b.append(it.next());
  
                  while (it.hasNext()) {
                      b.append(sep);
                      b.append(it.next());
                  }
              }
  
              value = b.toString();
              hasValue = true;
              done = true;
              return true;
          }
      }
  
  }
  